If you work for a large employer, you have benefits professionals who spend all year thinking about this - we work with small employers who don't have these kinds of resources and are happy to offload it onto us.
Anyone can easily use healthcare.gov to find a plan appropriate to their needs. And you’re healthcare providers are not tied to your employer, in case you leave your job.
And any employer that doesn’t offer HSAs is really screwing their employees by not giving the option of the best investment vehicle available to Americans.
An additional benefit is your compensation gets more transparent, as you can easily see the dollar amount of the benefits you’re receiving prior to accepting job offer.